Adobe Premiere Pro CS4 - Manual (Page 115)

109 USING ADOBE PREMIERE PRO CS4
Managing assets
Last updated 11/6/2011
You can also use the Properties feature to alert you to the presence of any dropped frames in a clip you just captured.
Use the data rate graph to evaluate how well the output data rate matches the requirements of your delivery medium.
It charts each frame of a video file to show you the render keyframe rate, the difference between compression
keyframes and differenced frames (frames that exist between keyframes), and data rate levels at each frame. The graph
includes the following information:
Data rate The line represents the average data rate.
Sample size The red bars represent the sample size of each keyframed frame.
Differenced frames sample size The blue bars represent the sample size of the differenced frames between
compression keyframes.
View the properties of a clip
❖ Do one of the following:
• If the clip is in the Project panel, select it to display a subset of its properties in the preview area at the top of the
Project panel.
• If the clip is in the Source Monitor, Timeline panel, or Project panel, select it and choose File > Get Properties For
> Selection.
• If the clip is not in the project, choose File > Get Properties For > File. Locate and select the clip you want to analyze,
and then click Open.
You can also view clip properties in the Source Monitor, Timeline panel, or Project panel by right-clicking (Windows)
or Control-clicking (Mac OS) a clip and choosing Properties.
Change the frame rate of a file
You can use the Interpret Footage command to change the frame rate that Premiere Pro assumes for a clip. Changing
the frame rate changes the original duration proportionally. For example, if you set a 10-second, 24-fps clip to 48 fps,
it becomes half as long, with a new duration of 5 seconds. Be aware that a clip’s frame rate is reconciled with the
project’s frame rate. For example, if you change a 24-fps clip to 48 fps and it’s used in a 24-fps project, the project can
display only every other frame of the clip.
You can also change clip speed and duration by choosing the Clip > Speed/Duration command for a clip selected in a
Timeline panel. However, such a change affects only that clip instance in a Timeline panel. Using the Interpret Footage
command changes how a file is interpreted throughout a project.
1 In the Project panel, select a clip.
2 Choose File > Interpret Footage, and do one of the following:
• Select Use Frame Rate From File,
• Select Assume This Frame Rate, and type the number of frames per second.
3 Click OK.